| A | B |
|---|
| fuel | a material that releases energy when it burns |
| subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
| inhibitor | a material that decreases the rate of a reaction |
| precipitate | a solid that forms from a solution during a chemical reaction |
| product | a substance that is formed as the result of a chemical reaction |
| enzyme | a biological catalyst that lowers the activation energy of reaction in cells |
| replacement | a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places |
| activation energy | the minimum amount of energy needed to start a chemical reaction |
| decomposition | a chemical reaction that breaks down a compound into simpler products |
| endothermic reaction | a reaction that absorbs energy in the form of heat |
| exothermic | a reaction that releases energy in the form of heat |
| conservation of mass | the principle stating that matter is not created or destroyed in a chemical reaction only changed in form |
| catalyst | a material that increases the rate of a chemical reaction by lowering the activation energy |
| chemical equation | uses symbols and formulas to show a chemical reaction |
| synthesis | a chemical reaction in which two or more simple substances combine to form a new more complex substance |
| combustion | a rapid reaction between oxygen and fuel that produces thermal energy |
| coefficient | a number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction |
| reactant | a substance that enters into a chemical reaction |
| concentration | the amount of one material dissolved in a given amount of another material |
